Incorrect. Just because the Terms of Use/Service & EULA is nullified doesn't mean that you didn't break several copyright laws in regards to the Trademarks. There's a lot of things that the Trademark protects and a private server in turn violates. I can sit here and just ramble on about how all the characters within World of Warcraft is protected by several trademarks. Thrall, Jaina, Van Cleef and so on. Let alone the world files, names of zones, models and pretty much every NPC in the game and to some extent the quests and possibly even the lore, although lore is technically in a gray zone.
All this is protected by trademarks which is then protected by laws in the respective countries, including the UK. Blizzard has the legal right to take these actions but it's still an immoral action to take and I apologize for the bluntness and rudeness in the next couple of words, Blizzard is still retarded for fucking over their community.
Anyway, don't listen to Dodgykebaab when it comes to legality, don't even listen to me. Pay and contact a lawyer in the respective country that specializes in trademark/copyright cases and educate yourself that way. There are obviously countries where they don't necessarily care much about copyright and trademarks and that's where you should go to host them. It's worth stressing this; If the server host releases the information of the private server owner and said owner is located in Denmark then the owner will have infringed Denmark's laws and face the crimes under Denmark's system. Regardless if the host server was in the North Pole.
Anyway, it's been pointed out repeatedly, Blizzard at this moment in time is within their legal right, even though in my opinion, they shouldn't have that right as much of the content in Vanilla is essentially abandon-ware.
In case anyone got a bit freaked out, it's also worth mentioning that in most countries in Europe, the end user (players) are within their legal right to play on private servers as our laws nullifies the ToU/S & EULA to an extent, so we're safe to play on servers, but not to run them. --- However, Blizzard has the right to terminate you from all their services (Battle.net, WoW, Diablo 3, etc)
TL;DR:
- Private servers are illegal due to trademarks and copyright which in turn is protected by laws in the respective country. If an owner is located in a country where trademarks and copyright is enforced, then said owner is viable for criminal charges. Regardless of server host location.
- Even if a copyright lawsuit is bogus, which in this case I highly doubt it was due to it being in France, it would still cost several hundreds of thousands to defend yourself against a bogus or non-bogus claim.
- ToU/S & EULA does not supersede the law.
- Blizzard is stupid for attacking their own community.
- Blizzard's action against a non profit organization like Nostalrius was legal but also incredibly immoral.
That's pretty much all I have to say about it. Bold text being the most important.